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(n)QAM
Modulation Run
Modes
Auxiliary
Functions
Digital Pulse
Generator
Programming the user PSK is easily done using very simple table
entries which define symbol and phase value. In this function, the
amplitude remains constant throughout the entire phase entries.
The (n)QAM function is similar to the standard ASK function except
the output can shift to multiple amplitudes and phase positions to
form an amplitude/phase shift constellations. There are 4 different
types of Quadrature Amplitude Modulation that the 2074 can
generate: 16QAM, 64QAM and 256QAM. If another constellation
scheme is required, one can use the User QAM to design his/her
own symbol list and constellation.
Run modes are shared by all waveforms that are generated by the
2074, including modulation. However, there are some limitations
that apply to the modulation functions. The modulation functions will
no operate in gated or burst mode, all other features that apply to
trigger are available for the user, including re-trigger and trigger
delay.
The 2074, besides its standard waveform generation functions, has
two additional auxiliary functions that can transform the instrument
to one of two, stand-alone, full-featured, instruments: Digital Pulse
Generator and Counter/Timer. Operating instructions for the
auxiliary functions are given in Chapter 3. The following describes
these two auxiliary functions in general.
The digital pulse generator auxiliary function transforms the 2074
into a four-channel pulse generator with the capability to generate
pulses exactly as they would be generated by a stand-alone pulse
generator instrument. When using this function one could program
all pulse parameters in timing units. All pulse parameters are
programmable including period, pulse width, rise and fall times,
delay, polarity and more. Operating instructions for the digital pulse
generator are given in Chapter 3. Model 2074 front panel and
ArbConnection control panel examples for the digital pulse
generator function are shown in figures 1-20 and 1-21, respectively.
1-29
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